Combined chair base and shin support unit



FIG. 1 is a perspective view of a combined chair base and shin support unit taken from below and showing my design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image thereof;

FIG. 3 is a rear elevational view; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a combined chair base and shin support unit, as shown and described. 